Correct javascript errors on my wordpress site

I am having some javascript errors which are causing my modal box contact form to fail. I have attached a screenshot of the errors for you to have a look at. The contact us box should bring up a modal box as it does in this page: [login to view URL] however on other pages, it will not load the modal box: [login to view URL] thank you for your bids. This should be a very easy job for the right person.